Clear the editor history

Deletes all the redo history

Creates a new undo action for the supplied target state

(When the action is performed it will call the supplied ActionCallback to handle the state restore)

NOTE: All actions pushed in the same frame are merged into a single action

Parameters

target
callback	Callback delegate that gets triggered to undo this action

Creates a new undo action for the supplied target state

(When the action is performed it will call the supplied ActionCallback to handle the state restore)

This also clean ups the Redo history as every new action creates a new history path that overrides anything that could be restored before the action was performed. NOTE: All actions pushed in the same frame are merged into a single action

Parameters

target
callback	Callback delegate that gets triggered to undo this action
destroyOnClear	Indicates whatever the target object should be destroyed if the redo history gets overridden
destroyTargets	Indicates the objects that should be clean as part of this, if this list is empty the target object will be destroyed instead

Redoes the last action undone in the history

Undoes the last action stored in the history

Are there undo actions on the stack

The current position in the list of actions.

This pushed onto the stack whenever an action is pushed and a new number generated. When applying undo/redos the id is updated with the one from the applied action Used by Builder to tell when the state of the Mission is the same as when it was saved

Class singleton instance